Not Finding Anythinf

Not Finding Anything...
Saturday morning when I woke up, I experienced burning on urination. I went to work, and being that it's at a hospital, I asked one of the MD's to write me a script for antibiotics. She wrote me a script for Bactrim, and by Monday I wasn't feeling any relief, in fact I started to experience flank pain. I went to my primary, who did a urine culture and analysis. Analysis showed bacteria, and I was given 500mg Cipro. Tuesday night the flank pain increased to the point where I went to the ER. The CT scan came back normal, my WBC's were normal. I was given an IM dose of 1g Rocephin and was told my flank pain should be gone within 24 hours.

I am still taking the Cipro but I haven't had any relief of the flank pain. Does anyone have an idea of what this could be? No temp, WBC's normal.